Periodicity
Periodicity, a Fabric equipment mod for 1.21.11, adds sidegrade ores and materials that sit alongside the vanilla ores in the game's progression.
What it does
Each added ore is a sidegrade: it is crafted from materials that come at roughly the same stage of progression as the regular material it replaces, so a player reaching that stage can choose it without skipping ahead. The Heliostone is one example, crafted in the same way from materials of the same tier as the vanilla ore it stands beside.
Equipment made from these ores can grant a special effect when a full set is worn. The effect belongs to the ore's armor set and applies only while every piece is equipped, which gives players a reason to commit to one material over another.
The mod needs Fabric API and runs on Fabric for 1.21.11. Both the server and every player need it, since the sidegrade recipes and armor effects must match on both sides. Files are released under the Apache License 2.0 and the project is not open source.
Key features
Vanilla ore sidegrades
Additional ores sit beside the vanilla ores and offer a different path through the same stage of progression.
Stage-matched crafting
Sidegrade materials are chosen to come at roughly the same point in progression as the regular material they parallel.
Heliostone
The Heliostone is an ore-based sidegrade crafted from materials of the same stage as the vanilla option it replaces.
Full-set armor effects
Armor made from each ore grants a special effect when every piece of its set is worn at once.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Choosing a material path
A player who reaches a stage of progression can pick the sidegrade ore instead of the vanilla one, and the armor effect may shape which path they prefer.
Multiplayer progression
Server owners who run the mod give every player the same sidegrade options and matching armor effects.
Who it’s for: Players on Fabric 1.21.11 who want alternative ores and armor sets tied to the vanilla progression. Server owners who want the same options for their players will need the mod installed on the server as well.
Questions
Does Periodicity need Fabric API?
Does Periodicity have to be installed on the server?
Which game versions does Periodicity support?
In the catalog
Periodicity is one of 17,631 Equipment mods on ModsFinder, and one of 8,894 Equipment mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
Ontop of this, each ore's armor gives you a special effect when the full set is worn.
Official listing
- Modrinth page
- modrinth.com/mod/periodicity
- Owner
- smallMANsmall
- Published
- 2026-07-28
- Updated on Modrinth
- 2026-07-28
- Facts verified
- 2026-10-15